The number of flights not arriving on time is a measure of service quality. This indicator is strongly seasonal and is affected by weather in winter months and heavy demand in summer months. The term "late" is defined as 15 minutes after the scheduled arrival time.
|Flights not arriving on time (percent)||16.05||17.69|
|Percent change from the same month in the previous year||11.77||10.22|
NOTES: The current value is compared to the value from the same period in the previous year to account for seasonality. The data cover those airlines that enplaned at least 1% of domestic passengers in the previous year and have also reported for at least two consecutive years. Aloha Airlines, which reported on-time statistics for October 2000 through November 2001, has been excluded to maintain comparability. Hawaiian Airlines, which began reporting in November 2003, and Comair, which began reporting in January 2004, have also been excluded.
Certain flights originating at O'Hare airport and operated by American Airlines (181 flights in April 2002) or United Airlines (256 flights in April 2002) between April 24, 2002 and May 8, 2002 are not included in the calculations due to the participation of these carriers in a pilot test program for enhanced baggage screening. A list of affected flights is available from BTS.
SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, Airline Service Quality Performance data, October 2005.